I have a an AV amp but want better sound quality, so I am thinking of buying a stereo amp to run along side my AV. I will be using the same speakers as I do for my two fronts channels of my AV set up. Is it simply a case of connecting one amp to one pair of terminals on the speakers, and the other amp to the other speaker terminals with more cable? Or have I got this totally wrong?? My AV amp is a Yamaha 640SE with plently of connections.